Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice

Tsung Yao Wu, Aishwarya Kumar, Felipe Giraldo, David Scott Weiss

Research output: Contribution to journalLetter

1 Citation (Scopus)

Abstract

Qubit state measurements are an essential part of any quantum computer, constituting the readout. Accurate measurements are also an integral component of one-way quantum computation and of error correction, which is needed for fault-tolerant quantum computation1. Here, we present a state measurement for neutral-atom qubits based on coherent spatial splitting of the atoms’ wavefunctions. It is reminiscent of the Stern–Gerlach experiment2, but carried out in light traps. For around 160 qubits in a three-dimensional array, we achieve a measurement fidelity of 0.9994, which is roughly 20 times lower error than in previous measurements of neutral-atom arrays3,4. It also greatly exceeds the measurement fidelity of other arrays with more than four qubits, including those with ion and superconducting qubits5,6. Our measurement fidelity is essentially independent of the number of qubits measured, and since the measurement causes no loss, we can reuse the atoms. We also demonstrate that we can replace atoms lost to background gas collisions during the experiment7.

Original languageEnglish (US)
Pages (from-to)538-542
Number of pages5
JournalNature Physics
Volume15
Issue number6
DOIs
StatePublished - Jun 1 2019

Fingerprint

neutral atoms
atoms
quantum computers
reuse
quantum computation
readout
traps
collisions
causes
gases

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Wu, Tsung Yao ; Kumar, Aishwarya ; Giraldo, Felipe ; Weiss, David Scott. / Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice. In: Nature Physics. 2019 ; Vol. 15, No. 6. pp. 538-542.
@article{879e76e328b24334bb649c53b1009a87,
title = "Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice",
abstract = "Qubit state measurements are an essential part of any quantum computer, constituting the readout. Accurate measurements are also an integral component of one-way quantum computation and of error correction, which is needed for fault-tolerant quantum computation1. Here, we present a state measurement for neutral-atom qubits based on coherent spatial splitting of the atoms’ wavefunctions. It is reminiscent of the Stern–Gerlach experiment2, but carried out in light traps. For around 160 qubits in a three-dimensional array, we achieve a measurement fidelity of 0.9994, which is roughly 20 times lower error than in previous measurements of neutral-atom arrays3,4. It also greatly exceeds the measurement fidelity of other arrays with more than four qubits, including those with ion and superconducting qubits5,6. Our measurement fidelity is essentially independent of the number of qubits measured, and since the measurement causes no loss, we can reuse the atoms. We also demonstrate that we can replace atoms lost to background gas collisions during the experiment7.",
author = "Wu, {Tsung Yao} and Aishwarya Kumar and Felipe Giraldo and Weiss, {David Scott}",
year = "2019",
month = "6",
day = "1",
doi = "10.1038/s41567-019-0478-8",
language = "English (US)",
volume = "15",
pages = "538--542",
journal = "Nature Physics",
issn = "1745-2473",
publisher = "Nature Publishing Group",
number = "6",

}

Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice. / Wu, Tsung Yao; Kumar, Aishwarya; Giraldo, Felipe; Weiss, David Scott.

In: Nature Physics, Vol. 15, No. 6, 01.06.2019, p. 538-542.

Research output: Contribution to journalLetter

TY - JOUR

T1 - Stern–Gerlach detection of neutral-atom qubits in a state-dependent optical lattice

AU - Wu, Tsung Yao

AU - Kumar, Aishwarya

AU - Giraldo, Felipe

AU - Weiss, David Scott

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Qubit state measurements are an essential part of any quantum computer, constituting the readout. Accurate measurements are also an integral component of one-way quantum computation and of error correction, which is needed for fault-tolerant quantum computation1. Here, we present a state measurement for neutral-atom qubits based on coherent spatial splitting of the atoms’ wavefunctions. It is reminiscent of the Stern–Gerlach experiment2, but carried out in light traps. For around 160 qubits in a three-dimensional array, we achieve a measurement fidelity of 0.9994, which is roughly 20 times lower error than in previous measurements of neutral-atom arrays3,4. It also greatly exceeds the measurement fidelity of other arrays with more than four qubits, including those with ion and superconducting qubits5,6. Our measurement fidelity is essentially independent of the number of qubits measured, and since the measurement causes no loss, we can reuse the atoms. We also demonstrate that we can replace atoms lost to background gas collisions during the experiment7.

AB - Qubit state measurements are an essential part of any quantum computer, constituting the readout. Accurate measurements are also an integral component of one-way quantum computation and of error correction, which is needed for fault-tolerant quantum computation1. Here, we present a state measurement for neutral-atom qubits based on coherent spatial splitting of the atoms’ wavefunctions. It is reminiscent of the Stern–Gerlach experiment2, but carried out in light traps. For around 160 qubits in a three-dimensional array, we achieve a measurement fidelity of 0.9994, which is roughly 20 times lower error than in previous measurements of neutral-atom arrays3,4. It also greatly exceeds the measurement fidelity of other arrays with more than four qubits, including those with ion and superconducting qubits5,6. Our measurement fidelity is essentially independent of the number of qubits measured, and since the measurement causes no loss, we can reuse the atoms. We also demonstrate that we can replace atoms lost to background gas collisions during the experiment7.

UR - http://www.scopus.com/inward/record.url?scp=85063447074&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85063447074&partnerID=8YFLogxK

U2 - 10.1038/s41567-019-0478-8

DO - 10.1038/s41567-019-0478-8

M3 - Letter

AN - SCOPUS:85063447074

VL - 15

SP - 538

EP - 542

JO - Nature Physics

JF - Nature Physics

SN - 1745-2473

IS - 6

ER -